Re: [Qemu-devel] [PATCH] PPC: fix PCI configuration space MemoryRegions for grackle/uninorth

[Alexander Graf]

On 18.12.2013, at 22:04, Benjamin Herrenschmidt <address@hidden> wrote:

> On Wed, 2013-12-18 at 13:34 +0100, Alexander Graf wrote:
>> Hrm. Are you 100% sure this correct? This UniNorth is a real headache.
>> The closest thing to a spec for it is the U4 spec which is generations
>> ahead:
>> 
>>  http://www.datasheetarchive.com/dl/Datasheets-SW3/DSASW0048084.pdf
>> 
>> On that at page 109 you can see that you do indeed have a range of
>> registers and a few fancy modes that can even be used to directly
>> access config space registers without the usual index/data cycle.
>> 
>> Ben, do you have any more insight into how the original Uninorth
>> worked?
> 
> Just index/data. Look at Linux :-)

Then I don't understand why we break when we limit the data region to 4 bytes.


Alex